Central Tendency & Variability
The exact middle of a dataset. Not sensitive to outliers.
A subset of people or things that is hopefully representative of ALL of those things or people.
What is a sample?
Ingredients: s, n, M, μ
What is a One Sample T-test?
When z-obtained is farther than 1.96 units away from zero.
What is reject the null hypothesis?
Sample Mean = 10
Sample SD = 5
Tywin's value = 15
What is a Z-score of +1.5?
M
What is a sample mean?
Ingredients: SSb, SSw, dfb, dfw
What is a One Way Anova?
When p is greater than .05.
What is accept the null hypothesis/reject the alternative?
Population Mean = 50
Population SD = 15
n = 9
Sample mean = 32
What is a Z-test result of -6.0?
σ2
What is a population variance?
27 random nail technicians who graduated from AVEDA.
What is a good sample of AVEDA Nail Technician Graduates?
When I want to predict screentime from another variable, such as age.
What is a correlation?
SSb = 1000, dfb = 2
SSw = 25000, dfw = 97
What is F = 1.94?
The average distance from the mean in original units.
What is the standard deviation?
A theoretical distribution of sampling means which better estimates a population mean the larger each sample is.
What is the sampling distribution?
When I want to compare ratings of a TV show from one season to the next season
What is a dependent Samples t-test?
t-obtained equals -1.32
What is accept the null/reject the alternative?
SD Difference Score = 6
n = 36
What is Dependent Samples t-obtained = -2.5
What is 2.28?
A bad sample if the population of interest is unsuccessful/failed youtube influencers.
What are successful youtube influencers?
When I want to know how flower color affects the influence of flower quantity on bouquet price
What is a TwoWay/Factorial ANOVA?
The correct decision when:
Group Mean 1 = 490.5
Group Mean 2 = 17.20
What is 'need more information, can't yet decide'?
M1 = 250
M2 = 251
Pooled Variance = 55
n1 = 49
n2 = 55
What is Independent Samples t-test = -0.686